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At least 19 recordsLinked to original sources
PubMedDate not supplied

[Thermostat electronic circuit for vital microscopy].

To provide optimal temperature conditions needed for vital microscopy, an electronic circuit for the thermostat has been elaborated. This unit is designed to heat and maintain at a definite temperature level the table for manipulations and the microscope objective. Thermoresistor MMT-4 served as a temperature transducer.

Animals↗
PubMed1978

Design and testing of a transistorized nerve stimulator.

Presently available equipment for nerve stimulation includes the relatively expensive multifunction pulse generators and the disposable dc stimulators. We have designed a semidisposable, two-transistor pulse generator that is portable, inexpensive, and capable of dynamic nerve stimulation.

Electric Stimulation↗
PubMed1975

A device for the maintenance of a constant body temperature, with some special features.

A device for the maintenance of constant body temperature of laboratory animals during experiments is presented. Some special features make it especially suitable for experiments in which small electrical events are to be recorded, because no 50 or 60 c/sec interference or spurious signals will occur from it, nor is the animal earthed through the apparatus. In 2 years of daily use it has proved to be a reliable and accurate working device.

Animals↗
PubMed1978

A gas-stream heater to control local skin temperature under evaporative sweat capsules.

A compact 4-W gas-stream heater for use with ventilated sweating capsules is described. The heating element is constructed from two modified 75-omega power resistors connected in parallel and contained in the capsule gas inlet tube. Heater power is controlled with integrated circuits which compare the output of a thermocouple, measuring either capsule skin or air temperature, with a predetermined target temperature. The unit responds fairly slowly to sudden large changes in target temperature, but once a steady state is achieved, maintains target temperature levels despite changes in evaporative heat loss. The device is well suited for studies in which local skin temperature or capsule air temperature must be elevated and clamped while the effects of other local stimuli or central thermoregulatory activity are studied, and in studies where the skin temperature effect on transepidermal water loss must be controlled.

Humans↗
PubMed1976

A microelectronic pH sensor.

This paper presents preliminary data on a new integrated circuit microelectronic pH sensor. The device is extremely miniaturized by the use of integrated circuit technology, and uses the intrinsic hydrogen ion selective properties of the gate insulator material. In order to make the device compatible with aqueous solution monitoring, the silicon dioxide-silicon nitride gate insulator structure is used. The integrated circuit chip was designed, processed, and packaged by a variety of techniques which protect all metal parts from the aqueous solution. Test data are reported on leakage current, sensitivity, reproducibility, linearity, stability, response time, and life. The results indicate that this type of pH sensor may have many significant advantages for biomedical research and application.

Biomedical Engineering↗
PubMed1977

Fabrication of pH-sensitive implantable electrode by thick film hybrid technology.

We report preliminary results of our experiments directed at fabricating pH-sensitive electrodes suitable for in vivo use by means of thick film screening techniques. Our results show that glass membranes of suitable thickness and possessing nearly theoretical sensitivity to pH can be fabricated by this process. A hybrid electrode structure permits the incorporation of a source follower FET amplifier directly adjacent to the pH membrane, significantly reducing response time and noise pick-up. Extension of the basic electrode structure to accommodate membranes sensitive to other ions is discussed.

Biomedical Engineering↗